System and method for automatically selecting a data source for providing data related to a query

ABSTRACT

A computer-implemented method of prioritizing a predefined set of electronic data sources includes the steps of electronically determining data sources in which at least one of one or more source fields is the same as a query data item of a query statement, electronically and dynamically ranking the data sources in which at least one of the one or more source fields is the same as the query data item based on at least the ability of the data sources to provide data at one or more query dimensions of the query statement and the extent of aggregation necessary to provide the data, and electronically identifying one or more of the data sources having the highest rank as preferred data sources for locating the data value.

RELATED APPLICATIONS

This application is related to U.S. patent application Ser. No. 11/729,373, entitled SYSTEM AND METHOD FOR AUTOMATICALLY GENERATING INFORMATION WITHIN AN ELECTRONIC DOCUMENT, filed Mar. 28, 2007, and is a continuation-in-part of U.S. patent application Ser. No. 12/177,742, entitled SYSTEM AND METHOD FOR AUTOMATICALLY SELECTING A DATA SOURCE FOR PROVIDING DATA RELATED TO A QUERY, filed Jul. 22, 2008, the contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to systems and methods for automatically selecting a data source, and more specifically to ranking a plurality of data sources based on their ability to provide data related to a query.

SUMMARY OF THE INVENTION

A computer-implemented method of prioritizing a predefined set of electronic data sources according to an exemplary embodiment of the present invention comprises the steps of: providing a database containing metadata related to the predefined set of electronic data sources, the metadata comprising, for each electronic data source, one or more source fields, each source field comprising a source data item or a source dimension; electronically receiving first signals at a processor, the first signals related to a query for a data value; electronically identifying a query data item and one or more query dimensions based on the query; electronically determining the data sources in which at least one of the one or more source fields is the same as the query data item; electronically and dynamically ranking the data sources in which at least one of the one or more source fields is the same as the query data item based on at least the ability of the data sources to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data; and electronically identifying one or more of the data sources having the highest rank as preferred data sources for locating the data value.

A system for prioritizing a predefined set of electronic data sources according to an exemplary embodiment of the present invention comprises: a database containing metadata related to the predefined set of electronic data sources, the metadata comprising, for each electronic data source, one or more source fields, each source field comprising a source data item or a source dimension; a query processor that receives a query for a data value and that electronically identifies a query data item and one or more query dimensions based on the query; a data source analyzer that determines the data sources in which at least one of the one or more source fields is the same as the query data item; a data source ranking engine that electronically and dynamically ranks the data sources in which at least one of the one or more source fields is the same as the query data item based on at least the ability of the data sources to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data; and a data source selection engine that electronically identifies one or more of the data sources having the highest rank as preferred data sources for locating the data value.

A computer system according to an exemplary embodiment of the present invention comprises a computer-executable program stored on a computer-readable medium having instructions executable on a computer processor for performing a method for prioritizing a predefined set of electronic data sources, the method comprising the steps of: providing a database containing metadata related to the predefined set of electronic data sources, the metadata comprising, for each electronic data source, one or more source fields, each source field comprising a source data item or a source dimension; electronically receiving first signals at a processor, the first signals related to a query for a data value; electronically identifying a query data item and one or more query dimensions based on the query; electronically determining the data sources in which at least one of the one or more source fields is the same as the query data item; electronically and dynamically ranking the data sources in which at least one of the one or more source fields is the same as the query data item based on at least the ability of the data sources to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data; and electronically identifying one or more of the data sources having the highest rank as preferred data sources for locating the data value.

In at least one embodiment, the metadata further comprises information regarding whether a relationship exists between one or more source dimensions of the data sources and the one or more query dimensions.

In at least one embodiment, if it is determined that a relationship exists between one or more source dimensions of the data sources and the one or more query dimensions, the metadata further comprises information regarding whether the relationship is a direct feed relationship or an indirect feed relationship.

In at least one embodiment, the relationships comprise one or more of the following relationship types: classification relationship and aggregation relationship.

In at least one embodiment, the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the one or more source dimensions of the data source are the same as the one or more query dimensions.

In at least one embodiment, the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on one or more of the following: quality of data in the data source, quantity of data in the data source, and user selection of one or more preferred data sources.

In at least one embodiment, if the one or more source dimensions of the data source are the same as the one or more query dimensions, the data source is ranked higher than the data sources that do not have one or more source dimensions that are the same as the one or more query dimensions.

In at least one embodiment, the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the data source includes one or more source dimensions that are related to the one or more query dimensions.

In at least one embodiment, if the data source includes one or more source dimensions that are related to the one or more query dimensions, the data source is ranked higher than the data sources that do not include one or more source dimensions that are related to the one or more query dimensions.

In at least one embodiment, if the data source includes one or more source dimensions that are in a direct feed relationship to the one or more query dimensions, the data source is ranked higher than the data sources that include one or more source dimensions that are in an indirect feed relationship with the one or more query dimensions.

In at least one embodiment, the step of electronically determining the data sources in which at least one of the one or more source fields are the same as the query data item comprises determining whether the one or more source fields are synonyms of the one or more query data items.

In at least one embodiment, the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the one or more source dimensions of the data source are synonyms of the one or more query dimensions.

In at least one embodiment, the method further comprises applying the one or more data sources sequentially to locate the data value.

In at least one embodiment, the method further comprises applying the one or more data sources in parallel to locate the data value.

In at least one embodiment, the step of ranking the data sources comprises assigning a score to each of the data sources based on at least the ability of the data source to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data.

These and other features of this invention are described in, or are apparent from, the following detailed description of various exemplary embodiments of this invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and related objects, features and advantages of the present invention will be more fully understood by reference to the following, detailed description of the preferred, albeit illustrative, embodiment of the present invention when taken in conjunction with the accompanying figures, wherein:

FIG. 1 is a block diagram of a system for automatically selecting a data source for providing data related to a query according to an exemplary embodiment of the present invention; and

FIG. 2 is a flowchart showing a method for automatically selecting a data source for providing data related to a query according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

Various exemplary embodiments of the present invention are directed to a method of prioritizing electronic data sources based on the data sources' ability to provide a data value in response to a query statement. Each query statement may include a data item and one or more dimensions. For the purposes of the present invention, the term “data item” may refer to a variable for which a value is being sought. For example, in the query statement, “Price of an Acura RSX”, the data item is “Price”. The term “dimension” refers to a category (qualifier) of the data item. In the above example, “car manufacturer” and “car model” are the dimensions, and “Acura” and “RSX” are the dimension values for these dimensions, respectively.

In exemplary embodiments of the present invention, a database containing metadata relating to a set of data sources may be provided. The metadata may include, for each data source, a collection of source fields that may include one or more source data items and optionally one or more source dimensions. For example, a data source may be a spreadsheet including information regarding price and horsepower of particular car models and makes, in which case the source data items would be “price” and “horsepower”, and the source dimensions would be the car model and make. The metadata may also include additional information, such as information relating to whether source dimensions are related and if so, what types of relationships exist between the source dimensions. For example, one dimension may be in a direct feed relationship or an indirect feed relationship with another dimension. For the purposes of the present invention, a dimension is in a “direct feed relationship” with another dimension when that dimension can be directly aggregated to the other dimension. For example, a dimension value like “Mustang” may be part of a group like “Ford”, and the child-parent relationship (e.g., Mustang is a kind of Ford) between these values indicates a “direct feed” relationship between their respective dimensions (car models can be aggregated to car manufacturer). Dimensions are in a “indirect feed relationship” when one dimension can be aggregated to another dimension only after being aggregated to one or more other dimensions. For example, edition (e.g., Mustang GT) is a direct feed of car model (e.g., Mustang) and an indirect feed of car manufacturer (e.g., Ford). The metadata may also include information related to the key fields of the data sources.

In an exemplary embodiment of the present invention, prioritization of the data sources may be performed by first identifying those data sources that contain a source field that is equivalent to the data item identified in the query. Those data sources are then assigned a score based on the whether the data sources include the required dimensions. It is also determined whether a particular data source includes dimensions that are in a direct feed relationship or an indirect feed relationship with other dimensions.

In an exemplary embodiment, a higher score is given to those data sources that include the required data item and dimensions. Also, a higher score is given to data sources that include dimensions that are in a direct relationship to the required dimension as compared to data sources having dimensions that are in an indirect relationship to the required dimension. Data sources not containing both the required query data items and source dimensions that are equivalent to or aggregate to all query dimensions may be given a score of zero, indicating that such data sources are not capable of providing the necessary information in response to the query statement. Also, data sources that have additional source dimensions not needed for the query data may be assigned a lower score. It should be appreciated that the present invention is not limited to this scoring scheme, and any other scoring method may be used that takes into account the above factors. For example, lower scores may be assigned to data sources having the required data item and data dimensions.

The data sources are then prioritized based on their assigned scores. In an embodiment, the data sources having the highest scores are preferred for identifying the required data value in response to the query. In an embodiment of the invention, data sources having scores of zero would not be considered.

The data source may further be prioritized based on other factors, such as, for example, quality of data in the data sources, quantity of data in the data sources, and user selection of one or more preferred data sources.

According to another aspect of the invention, the system may be capable of recognizing synonyms so as to determine whether a particular source data item matches a query data item or whether a particular source dimension matches or is related to a query dimension.

FIG. 1 is a block diagram of a system, generally designated by reference number 1, for automatically selecting a data source for providing data related to a query according to an exemplary embodiment of the present invention. The system 1 includes a processor 5, a memory 7, a database manager 10, a database 12, a query processor 20, a data source analyzer 30, a data source scoring engine 40, a data source ranking engine 50, and a data source selection engine 60. Various components of the system 1 may generate instructions that are executable on the processor 5. In this regard, the various components may be made up of computer software components, computer hardware components, or a combination of software and hardware components.

The database manager 10 stores metadata relating to a predefined set of electronic data sources in the database 12. The database 12 may be a virtual database, a conventional database or a combination of conventional and virtual databases. The database 12 may be located remote from the other components of the system 1, such as, for example, in remote communication over an Internet connection, WAN or LAN, or integrated within the system 1. The metadata relating to the data sources may include, for each data source, at least one data item and at least one dimension. The metadata may also include a list of relationships between dimensions. For example, there may be classification relationships (e.g., the dimension value “April-2008” is a sub-class of the dimension “month”; the dimension value “Google” is a sub-class of the dimension “company”; the dimension value “Camry” is a sub-class of the dimension “car model”) and hierarchy relationships (e.g., the dimension values “April-2008”, “May-2008” and “June-2008” aggregate to the dimension value “2Q08”; the dimension values “MDX”, “RDX”, “RL”, “TL” and “TSX” aggregate to the dimension value “Acura”) between dimensions. Further, a dimension may be a direct or indirect feed into other dimensions. In this regard, in combining the metadata into a dimension/data feed list, the system 1 may automatically build a list of all dimensions appearing in any of the data sources, assign a one or more character code for each dimension, build a list of which dimensions may feed directly into other dimensions by identifying which dimension values aggregate into values of other dimensions, and build a list of which dimensions can feed indirectly into other dimensions by applying multiple feeds. For time dimensions, a dimension/data feed table may be provided automatically with, for example, “Day”, “Week”, “Month”, “Quarter”, “HalfYear”, “Year”, where each dimension feeds those of longer duration.

The query processor 20 receives and analyzes a query to determine a query data item and a query dimension. Preferably, the query processor 20 is capable of recognizing dimensions and data items, otherwise known as data descriptors, within a query. In this regard, a rule-based algorithm may be used to determine the data descriptors. For example, such an algorithm may use rules based on the relative location or the format of the entered query, or such rules may predefine a specific data entry as a data item or a dimension. As a further example, in the case in which the query is in the form of a spreadsheet having blank fields, the query processor 20 may recognize the row and column headers as data descriptors. It should be appreciated that the present invention is not limited to the use of a rule-based algorithm for the determination of data descriptors. For example, the query processor 20 may use natural language processing, or the query processor 20 may communicate with a user to determine the context in which an ambiguous term is used (e.g., the term “Ford”, which may refer to the automobile manufacturer, the brand of automobile or the person). In this regard, the query processor 20 may communicate with the user by, for example, a dialog box, instant message or e-mail.

The data source analyzer 30 determines which of the data sources includes a source field that is equivalent to the query data item. In this regard, the data source analyzer 30 may compare the query data item recognized by the query processor 20 with the source fields in each of the data sources.

The data source scoring engine 40 assigns a score to the data sources based on a number of factors, including the ability to provide data at the query dimensions and the extent of aggregation necessary to provide the data at the query dimensions. In an exemplary embodiment of the present invention, the data source scoring engine 40 assigns a score of “0” to any data source that does not contain the required data item and that data source is eliminated. For each query dimension and for each data source, if the data source has a dimension that directly matches the query dimension, a predetermined number X of points is added to that data source's score (e.g, X=10,000). If the data source has a dimension that is in a direct feed relationship with the query dimension, a predetermined number Y of points is added to that data source's score, where Y<X (e.g., Y=100). If the data source has a dimension that is in an indirect feed relationship with the query dimension, a predetermined number Z of points is added to that data source's score, where Z<Y<X (e.g., Z=1). If the data source does not include a dimension that matches or is related to the query dimension, that data source is assigned a score of “0”. If all data sources are assigned scores of “0”, it may be determined by a separate algorithm that two or more data sources appropriately joined together may function as a single data source that would qualify for a non-zero score. In an exemplary embodiment, if a data source has additional dimensions not used for the query, that data source's score may be divided by some amount (e.g., 10) for each such dimension.

The data source scoring engine 40 may take other factors into consideration besides the ability of the data sources to provide data at the query dimensions and the extent of aggregation necessary to provide the data at the query dimensions. For example, quality of data, quantity of data and user selection of preferred data sources may also be considered.

The data source ranking engine 50 ranks the data sources based on their scores assigned by the data source scoring engine 40. The data source with the highest non-zero score is the preferred data source, and may be queried first. The remaining data sources are preferably ranked in descending order by score as backup sources for the query. If multiple data sources are assigned scores greater than zero, a computer implemented algorithm may be used to search those data sources for data values that satisfy the query. These searches may be done either sequentially, starting with the highest rated source and continuing until either the query is satisfied or all data sources are exhausted, or in parallel, with query requests sent to all qualifying sources at the same time.

FIG. 2 is a flowchart showing a method, generally designated by reference number 200, for automatically selecting a data source for providing data related to a query according to an exemplary embodiment of the present invention. In step S210, the query processor 20 determines a query data item and one or more query dimensions based on the query. As explained above, the data descriptors related to the query may be determined using, for example, a rule-based algorithm.

In step S220, the data source analyzer 30 determines which of the data sources have source fields that are equivalent to the query data item. Any data sources that do not include the query data item are eliminated as potential data sources for the query.

In step S230, the data source scoring engine 40 assigns a score to the data sources based on a number of factors, including, for example, the data source's ability to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data value at the query dimension. In this regard, a higher score may be given to those data sources that include the query dimension, and a lower score may be assigned to those data sources that include dimensions that are related to the query dimensions. A lower score may be assigned to those data sources that include dimensions that are in an indirect relationship to the query dimension as compared to the score assigned to data sources having dimensions that are in a direct relationship with the query dimension. Scoring may also be based on, for example, quality of the data in the data source, quantity of data in the data source, and user selection of one or more preferred data sources.

In step S240, the data source ranking engine 50 ranks the data sources based on the their assigned scores, with the highest scored data source preferably ranked first. In step S250, the data source selection engine 60 selects highest scored data source as the preferred data source for providing the data in response to the query. The remaining data sources are made available as back-up data sources in case the preferred data source is unable to provide the necessary data.

The following example demonstrates a selection of a data source based on a query according to an exemplary embodiment of the invention:

EXAMPLE 1

The following query is input by a user:

Data Item: Sales Dimensions/Values: Model = Camry Month = April-08

The data source database includes the following metadata related to a number of available data sources (Tables 1-6):

Table# Term Data Item Dimension 1 Sales Yes No Month No Yes Model No Yes 2 Sales Yes No Corp No Yes Year No Yes HQ State No Yes 3 Sales Yes No Region No Yes Company No Yes Day No Yes 4 Sales Yes No Dealer No Yes Edition No Yes Model No Yes Year No Yes 5 Sales Yes No Deliveries Yes No Dealer No Yes Model No Yes Week No Yes 6 Deliveries Yes No State No Yes Model No Yes Quarter No Yes

The data source database also includes the following lists of classification and aggregation relationships:

Classification Relationships: Entity Is A Sub-Class Of Camry Model Accord Model Toyota Company Lincoln Company Ford Motor Corp General Motors Corp

Aggregation Relationships: Entity Aggregates To Camry Toyota Odyssey Honda Accord Honda Town Car Lincoln Lincoln Ford Motor Chevrolet General Motors

The database manager generates the following dimension/data feed list using all dimensions included in the data sources, with feeds implied from the hierarchy relationships:

Indirect Code Dimension Direct Feeds Feeds A Model F B Company AE F C HQ State BH AEF D Region G E Dealer F Edition G State H Corp B AEF 1 Day 2 Week 1 3 Month 12 4 Quarter 123 5 Year 1234

Using the metadata stored in the system database, the data source analyzer and data source scoring engine is able to generate the following list of scored data sources:

Table # Score 1 20000 2 0 3 0 4 0 5 1010 6 0

The scoring is determined as follows:

-   -   1. Tables 1-5 all contain the query data item (Sales). Table 6         does not, so it is eliminated as a potential data source for the         query.     -   2. Tables 2 and 4 are ineligible because their time dimension         (Year) is more aggregated than the required query time dimension         (Month).     -   3. Table 3 does not contain the query dimension (Model). It does         contain Region and Company, but neither of these dimensions can         be aggregated to the dimension Model.     -   4. Table 1 is the preferred source, since it has the highest         score (20,000). Table 1 contains both query dimensions, Month         and Model, as source dimensions.     -   5. Table 5 is the only eligible backup source. Table 5 does         contain the query data item (Sales) and query dimension (Model).         It also has a dimension (Week) that is a direct feed to query         dimension (Month). In addition, it has one dimension (Dealer)         that is not used for the query.

Now that the preferred embodiments of the present invention have been shown and described in detail, various modifications and improvements thereon will become readily apparent to those skilled in the art. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. 

1. A computer-implemented method of prioritizing a predefined set of electronic data sources, the method comprising the steps of: providing a database containing metadata related to the predefined set of electronic data sources, the metadata comprising, for each electronic data source, one or more source fields, each source field comprising a source data item or a source dimension; electronically receiving first signals at a processor, the first signals related to a query for a data value; electronically identifying a query data item and one or more query dimensions based on the query; electronically determining the data sources in which at least one of the one or more source fields is the same as the query data item; electronically and dynamically ranking the data sources in which at least one of the one or more source fields is the same as the query data item based on at least an ability of the data sources to provide data at the one or more query dimensions and an extent of aggregation necessary to provide the data; electronically identifying one or more of the data sources having the highest rank as preferred data sources for locating the data value; wherein the metadata further comprises information regarding whether a relationship exists between one or more of the source dimensions of the data sources and the one or more query dimensions; wherein, if it is determined that a relationship exists between the source dimensions and the one or more query dimensions, the metadata further comprises information regarding whether the relationship is a direct feed relationship or an indirect feed relationship; wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the data source includes one or more source dimensions that are related to the one or more query dimensions; and wherein, if the data source includes one or more source dimensions that are in a direct feed relationship to the one or more query dimensions, the data source is ranked higher than the data sources that include one or more source dimensions that are in an indirect feed relationship with the one or more query dimensions.
 2. The method of claim 1, wherein the relationships comprise one or more of the following relationship types: classification relationship and aggregation relationship.
 3. The method of claim 1, wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether one or more of the source dimensions of the data source are the same as the one or more query dimensions.
 4. The method of claim 3, wherein, if one or more of the source dimensions of the data source are the same as the one or more query dimensions, the data source is ranked higher than the data sources that do not have one or more source dimensions that are the same as the one or more query dimensions.
 5. The method of claim 1, wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on one or more of the following: quality of data in the data source, quantity of data in the data source, and user selection of one or more preferred data sources.
 6. The method of claim 1, wherein, if the data source includes one or more source dimensions that are related to the one or more query dimensions, the data source is ranked higher than the data sources that do not include one or more source dimensions that are related to the one or more query dimensions.
 7. The method of claim 1, wherein the step of electronically determining the data sources in which at least one of the one or more source fields are the same as the query data item comprises determining whether the one or more source fields are synonyms of the one or more query data items.
 8. The method of claim 1, wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the one or more source dimensions of the data source are synonyms of the one or more query dimensions.
 9. The method of claim 1, further comprising applying the one or more data sources, sequentially to locate the data value.
 10. The method of claim 1, further comprising applying the one or more data sources in parallel to locate the data value.
 11. The method of claim 1, wherein the step of ranking the data sources comprises assigning a score to each of the data sources based on at least the ability of the data source to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data.
 12. A system for prioritizing a predefined set of electronic data sources, comprising: a database containing metadata related to the predefined set of electronic data sources, the metadata comprising, for each electronic data source, one or more source fields, each source field comprising a source data item or a source dimension; a query processor that receives a query for a data value and that electronically identifies a query data item and one or more query dimensions based on the query; a data source analyzer that determines the data sources in which at least one of the one or more source fields is the same as the query data item; a data source ranking engine that electronically and dynamically ranks the data sources in which at least one of the one or more source fields is the same as the query data item based on at least an ability of the data sources to provide data at the one or more query dimensions and an extent of aggregation necessary to provide the data; a data source selection engine that electronically identifies one or more of the data sources having the highest rank as preferred data sources for locating the data value; wherein the metadata further comprises information regarding whether a relationship exists between one or more source dimensions of the data sources and the one or more query dimensions; wherein, if it is determined that a relationship exists between one or more source dimensions of the data sources and the query dimensions, the metadata further comprises information regarding whether the relationship is a direct feed relationship or an indirect feed relationship; wherein the data source ranking engine determines the ability of the data source to provide data corresponding to the one or more query dimensions based on whether the data source includes one or more source dimensions that are related to the one or more query dimensions; and wherein the data source ranking engine ranks the data sources in which one or more source dimensions are in a direct feed relationship to the one or more query dimensions higher than the data sources that include one or more source dimensions that are in an indirect feed relationship with the one or more query dimensions.
 13. The system of claim 12, wherein the relationships comprise one or more of the following relationship types: classification relationship and aggregation relationship.
 14. The system of claim 12, wherein the data source ranking engine determines the ability of the data source to provide data corresponding to the one or more query dimensions based on whether the one or more source dimensions of the data source are the same as the one or more query dimensions.
 15. The system of claim 14, wherein the data source ranking engine ranks the data sources in which one or more source dimensions are the same as the one or more query dimensions higher than the data sources that do not have one or more source dimensions that are the same as the one or more query dimensions.
 16. The system of claim 12, wherein the data source ranking engine determines the ability of the data source to provide data corresponding to the one or more query dimensions based on one or more of the following: quality of data in the data source, quantity of data in the data source, and user selection of one or more preferred data sources.
 17. The system of claim 12, wherein the data source ranking engine ranks the data sources in which one or more source dimensions are related to the one or more query dimensions higher than the data sources that do not include one or more source dimensions that are related to the one or more query dimensions.
 18. The system of claim 12, wherein the data source analyzer determines the data sources in which at least one of the one or more source fields are the same as the query data item by determining whether the one or more source fields are synonyms of the one or more query data items.
 19. The system of claim 12, wherein the data source ranking engine determines the ability of the data source to provide data corresponding to the one or more query dimensions based on whether the one or more source dimensions of the data source are synonyms of the one or more query dimensions.
 20. The system of claim 12, wherein the data source ranking engine ranks the data sources based on scores electronically assigned to the data sources.
 21. A computer system comprising a computer-executable program stored on a computer-readable medium having instructions executable on a computer processor for performing a method for prioritizing a predefined set of electronic data sources, the method comprising the steps of: providing a database containing metadata related to the predefined set of electronic data sources, the metadata comprising, for each electronic data source, one or more source fields, each source field comprising a source data item or a source dimension; electronically receiving first signals at a processor, the first signals related to a query for a data value; electronically identifying a query data item and one or more query dimensions based on the query; electronically determining the data sources in which at least one of the one or more source fields is the same as the query data item; electronically and dynamically ranking the data sources in which at least one of the one or more source fields is the same as the query data item based on at least an ability of the data sources to provide data at the one or more query dimensions and an extent of aggregation necessary to provide the data; electronically identifying one or more of the data sources having the highest rank as preferred data sources for locating the data value; wherein the metadata further comprises information regarding whether a relationship exists between one or more source dimensions of the data sources and the one or more query dimensions; wherein, if it is determined that a relationship exists between one or more source dimensions of the data sources and the one or more query dimensions, the metadata further comprises information regarding whether the relationship is a direct feed relationship or an indirect feed relationship; wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the data source includes one or more source dimensions that are related to the one or more query dimensions; and wherein, if the data source includes one or more source dimensions that are in a direct feed relationship to the one or more query dimensions, the data source is ranked higher than the data sources that include one or more source dimensions that are in an indirect feed relationship with the one or more query dimensions.
 22. The computer system of claim 21, wherein the relationships comprise one or more of the following relationship types: classification relationship and aggregation relationship.
 23. The computer system of claim 21, wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the one or more source dimensions of the data source are the same as the one or more query dimensions.
 24. The computer system of claim 23, wherein, if the one or more source dimensions of the data source are the same as the one or more query dimensions, the data source is ranked higher than the data sources that do not have one or more source dimensions that are the same as the one or more query dimensions.
 25. The computer system of claim 21, wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on one or more of the following: quality of data in the data source, quantity of data in the data source, and user selection of one or more preferred data sources.
 26. The computer system of claim 21, wherein, if the data source includes one or more source dimensions that are related to the one or more query dimensions, the data source is ranked higher than the data sources that do not include one or more source dimensions that are related to the one or more query dimensions.
 27. The computer system of claim 21, wherein the step of electronically determining the data sources in which at least one of the one or more source fields is the same as the query data item comprises determining whether the one or more source fields are synonyms of the one or more query data items.
 28. The computer system of claim 21, wherein the ability of the data source to provide data corresponding to the one or more query dimensions is determined based on whether the one or more source dimensions of the data source are synonyms of the one or more query dimensions.
 29. The computer system of claim 21, further comprising applying the one or more data sources sequentially to locate the data value.
 30. The computer system of claim 21, further comprising applying the one or more data sources in parallel to locate the data value.
 31. The computer system of claim 21, wherein the step of ranking the data sources comprises assigning a score to each of the data sources based on at least the ability of the data source to provide data at the one or more query dimensions and the extent of aggregation necessary to provide the data. 